# \w+@[a-z]\d+\.[a-z]

import re
# ret = re.findall(r'\d+','hahahh222哈哈333哈哈')
# print(ret)
# ret = re.finditer(r'\d+','hahahh222哈哈333哈哈')
# print(ret)
# new = ret.__next__()
# print(new.group())
# for item in ret:
#     print(item.group())

# ret = re.match(r'\d+','hahahh222哈哈333哈哈')
# print(ret)

# ret = re.search(r'\d+','hahahh222哈哈333哈哈')
# print(ret.group())

# obj  = re.compile(r'www\.(baidu)\.com')
# it = obj.finditer('www.baidu.com,www.jd.com')

